PPSh-s though? Why? One would think they would mount a better weapon than a bunch of PPShs.
Not that they're bad, just not a good choice for something like this.
Shouldn't be something a plane can't handle. These are SMGs after all.
The AT variants of the JU 88 didn't seem to have to big a problem handling the cannon mounted on them.
Now imagine having to reload all those. 72 rounds a mag isn't very much for this purpose.
I think it's a useless idea though. What's the point of having 88 of them? 3 or 4 high ROF MGs would prove just as effective. No difference between hitting a person with 5 bullets or 47 either way they're dead. Besides they all seem to be firing into the same general area, once again, overkill. Also when an enemy ground attack plane flies so low overhead, it's rare that troops will stand in such high concentration for something like this to have a purpose.